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3 Answers

THESE MEASUREMENTS ARE BASED ON WHERE THE WII REMOTE IS, NOT YOUR STANDING POSITION.

Minimum (from my experience); Merely 2.5 feet, around 76 centimeters

Recommended distance; 6 feet, around 1.8 meters

Maximum; Depends on the sensitivity level that's set. Max sensitivity can reach pretty far, but other sources of InfraRed light (like candles) can interfere.
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The metric measurements should be pretty close to the U.S./British (Not sure) Imperial measurements, which is what I'm used to. I'm just trying to get this answered internationally to those who also have the same question.